Leviticus 23:10 states that; when they come into the land
they were to wave the sheaf of the first fruit on
the morrow after the Sabbath, and verse 15 says
that they were to begin a count on the morrow after
they brought the sheaf and verse 14 says they could
not eat parched corn, etc., until the self-same
day they brought an offering. Now, Josephus and
Philo both agree this would always be on the 16th
(morrow after the Sabbath, the 15th) when the Priest
would wave the sheaf, and they lived in the time
when the Priesthood was still active. This means
the Sabbath will always be on the 15th every year,
and the only way this can happen is to count the
Sabbaths by the moon. It also proves the Sabbath
in the first moon each year will be on the 15th
every time, which is impossible to happen when using
the Roman calendar.

Turn to Joshua 5:11 and see that they came into
the land and did exactly what was told to them.
They kept the Passover on the fourteenth day at
even (night, which begins the 15th). In verse 10,
they ate parched corn, etc. On the morrow after
the Passover (15th), which would be the 16th. This
proves the 15th was the Sabbath and 16th was the
morrow after, as the two Historians who watched
the Priest doing it this way confirm. The manna
ceased on the same morrow (or the 16th) after forty
years. It had begun forty years earlier on the 16th
(Ex. 16). In addition, we can prove the Messiah
rose on the 16th of Abib when the first fruit was
to be lifted up and He was the first fruit of them
that sleep. (I Cor.15:20-23) He did not rise on
the 17th or 18th, as some suppose. He rose the third
day according to the Scriptures, and the only Scripture
to be found is the first fruit of the wave sheaf,
which was on the 16th, and He was truly the first
fruit, and was waved on the 16th according to the
scriptures.